At the beginning of the year, Parker had $30 in savings and saved an additional $15 each week thereafter. Caleb started the year with $70 and saved $5 every week. Let P represent the amount of money Parker has saved t weeks after the beginning of the year and let C represent the amount of money Caleb has saved t weeks after the beginning of the year. Graph each function and determine the number of weeks after the beginning of the year until Parker and Caleb have the same amount of money saved.